Elemental chlorine free bleaching of oakwood kraft pulp with enzymes

摘要

Elemental chlorine had been used to improve the brightness of chemical pulp for long time because of lower price. But it release the toxic substances like dioxin and AOX in the bleaching process[1,2]. The new bleaching process, using enzymes(xylanase, cellulase etc.), had been developed since the middle of 1980's[3, 4, 5]. Therefore, this investigation was carried out to use the crude enzyme complex secreted from fungus in the bleaching process, because purified enzymes are too expensive.